Vibrator.



W. VAN B. ROBERTS.

` vlaanon.

APPLICATIBN FILED JUNE 2. |916.

Patented Oct. 16, 1917.

- UNITED sTATEs PATENT oEEIoE.

. WALTER VAN B. ROBERTS, 0F PRINCETON, NEW JERSEY, 'ASSIGNOB T0 ROBERT E. E HOPKINS, OF TABRYTOWN, NEW YORK.

Specication of Letters Patent.

Patented Oct. 16, 191 '7.

Application led I une 2, 1918. Serial No. 101,427.

To all whom 'it may concern.' Be, it known that I, WALTER VAE B. ROBERTS, a citizen of the United States, re-

siding at Princeton, in the county of Mer-4 cer and State of New Jersey, have invented certain new and useful Improvements in Vibrators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains tol make and use the same.

This invention relates to vibrators for use in foundries and the like.

' It has for an object to provide a very simple construction in which the operative parts are effectively protected against mechanical injury and also to protect the userV from electrical currents.

A further vobject of this invention is the provision of a housing formed of complemental sections, of which one,section is of non-magnetic metal while the other one may beof magnetic material to assist the electromagnetsin said housing, and movably carried in said' non-magnetic portion is an armature to be affected by 4magnetic impulses from' windings in said housing.

Further objects will be apparent from the following specification, appended claims and drawings, in which,

Figure 1 is a side elevation of the vibrator,.

Fig. 2 is a plan view thereof,

. Fig. 3 -is a bottom view of the upper por-- tion of the housing4 or casing, A

Fig.' 4 is a vertical sectional view through the vibrator as on the line 4-4 of Fig. 2, and

Fig. 5 is a vertical cross sectional view as on .the line 5-5 of Fig. 2.

This vibrator is intended for use in foundries and it is apparentthat it may beused in several capacities such as removing the patterns from the mold or for dislodging powder subsequently applied to the mold if desired.

Referring to the drawings, in which the several parts are described, 10 indicates a base which will preferably be of magnetic metal and this base may be cast to-have the ears 11 formed thereon, which may be perforated 'as at 12 'to receive 'fastening means, and to the sides of this base member 4 are formed lugs 13 which receive fastening means for an upper member of said'casing.

- The base member hasla flange 14 formed thereabout, upon which the lower face of an upper member 15 bears. The upper member may be cast of a non-magnetic metal such as aluminum and will preferably have the tapering sides as shown, to permit the casting being drawn from the mold. The sidewalls of the member 15 have the lugs 16 formed thereon to receive hscrews 17 which pass through the lugs 13 and the upper member 15 has a boss 17 formed thereon which is drilled as at 18 to receive the stem 19, on which an adjusting nut 20 may be placed to regulate the compression of a spring 21 which serves to raise the stem 19 and the armature 22 carried thereby, from contact with the cores of the electro-magnets including the windings 24. The casing 15 has wings 25 formed therein, which serve as guides for the armature 22 to restrict said armature to movement ina vertical position with respect to the casing 15. The stem 19 may be secured to this armature in any4 desired means, but I have shown a threaded portion 26 on said stem which'engages in a threaded socket 27 in said armature.

The cores 23 have their lower ends tapped as at 28 tov receive'the screws 29 which pass through the base member 10 as shown, and the windings 24 are connected to the electric conductors 30 so that 4as a pulsating current is sent through said conductors and the windings 24, the armature 22 is vibrated and in its vibration the entire vibrator is agitated, so that a vibrating motion is imparted to a bench or flask to which the'vibrator may be applied.

The vibrator above described is designed for operation with, alternating current included within the housing, but when yit is desired `to operate the vibrator on direct attached. A spring 36 serves to return the 4armature and a screw 37 which may be adjustably secured in a, bracket 38, supports the other of the contacts of the interrupter 31. The winding 32 also adds n load to the circuit which relieves to a slight extent, undue heating of the coils 24 for use with direct current as the winding 32 partly forms a resistance coil, but it is understood that for use with alternating current auch as from a lighting circuit, no other interrupter -is required as the frequency of said alternating current establishes the vibration from the armature 22.

It is apparent that modiiications may be made Within the scope of the appended claims andthe foregoing description, and that the drawing submitted herewith is for .illustrative purposes only.

Having thus described this invention, I claim In a vibrator of the class described, a base of magnetic material having perforated ears formed thereon, a flange rising from said base, lugs formed on the sides of said closed circuit with an external source of pulsating current.

In testimony whereof I affix my signature in presence of two witnesses.

WALTER VAN B. ROBERTS. Witnesses:

IRVING W. MERSHON, RAYMOND CoR'rELYoU. 

